I agree you need to make some kind of move, but some men are more cerebral and slow moving than others so it needs to be subtle.
I liked someone, huge age difference, plus I think initially he thought I was older than I was which was extra awkward at first, we were platonic friends, fascinating man but very quiet. I asked him one day why he was single and he said he 'wasn't very good with women, not really what they are usually looking for'. I said 'They're stupid then, we ought to go out for lunch one day, I think you're fascinating.' and devastatingly ( at the time) he looked horrified and said ' God I don't know what to say to that...'. so I just smiled and said ' Well let's not let it cause weirdness between us, want a coffee?' and went off and made him one. Ensuing awkwardness for a bit.
The next 3 times I went to the house he made himself absent and I assumed I'd stuffed it and he wasn't interested and was making himself scarce and then totally out of the blue he invited me to the Battle Proms and it's been fine ever since.
Make a move but keep it light, you never know until you try, h might just be a man who is more interested in interesting things than pouncing on everything in a skirt.